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Analog Devices Inc./Maxim Integrated LM4040AEX3-3.0/V+T
- Part No.:
- LM4040AEX3-3.0/V+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SC-70, SOT-323
- Datasheet:
-
LM4040AEX3-3.0/V+T.pdf
- Description:
- IC VREF SHUNT 0.1% SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,699
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Product details
Overview
LM4040AEX3-3.0/V+T from Maxim Integrated is a precision 3.000V, two-terminal shunt voltage reference in SC70-3 package with 0.1% initial accuracy, ±100ppm/°C temperature coefficient, and guaranteed operation from –40°C to +125°C. It delivers stable reverse breakdown voltage across 60μA–15mA shunt current and supports space-constrained battery-powered systems requiring high accuracy and low noise.
For engineers reviewing the LM4040AEX3-3.0/V+T datasheet, LM4040AEX3-3.0/V+T pinout, LM4040AEX3-3.0/V+T application, or LM4040AEX3-3.0/V+T equivalent, this page provides verified specifications, thermal performance data, AEC-Q100 qualification status, and validated alternative options for automotive and industrial reference design.
Technical Context
The LM4040AEX3-3.0/V+T uses bandgap-based shunt architecture to maintain a precise 3.000V reverse breakdown voltage without external capacitors. Its laser-trimmed resistor network ensures 0.1% initial tolerance at +25°C and guarantees ±3.0mV (±0.1%) total error over –40°C to +125°C when combined with its 100ppm/°C tempco.
It operates as a two-terminal device with cathode-anode polarity, sinking 60μA–15mA shunt current while maintaining low dynamic impedance (≤0.8Ω at 1mA) and 45µVRMS wideband noise (10Hz–10kHz). The /V suffix confirms AEC-Q100 qualification for automotive applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.000V nominal; ±3.0mV (±0.1%) initial accuracy at +25°C - enables direct replacement of 3.0V references in ADC/DAC biasing and sensor excitation circuits. |
| Temperature Coefficient | ±100ppm/°C max - ensures ≤±30mV drift over full –40°C to +125°C range, critical for engine control and battery management systems. |
| Operating Current Range | 60μA to 15mA - supports ultra-low-power sleep modes and high-current regulation without external components. |
| Dynamic Impedance | ≤0.8Ω at 1mA, 120Hz - maintains voltage stability under fast load transients common in microcontroller power sequencing. |
| Wideband Noise | 45µVRMS (10Hz–10kHz) - minimizes measurement uncertainty in precision analog front-ends for medical and test equipment. |
| AEC-Q100 Qualification | Qualified per /V suffix - meets stress testing requirements for automotive Grade 1 (–40°C to +125°C junction), including HTOL and TC. |
| Package | SC70-3 (1.8mm × 1.8mm) - 50% smaller than SOT23, enabling high-density PCB layouts in portable and ADAS modules. |
Pinout & Package
SC70-3 surface-mount package (1.8mm × 1.8mm, 0.95mm height); RoHS-compliant, lead-free; top mark ALN; pin 3 is no-connect (must be left unconnected or tied to pin 2).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Cathode | Reverse-biased terminal; connects to regulated output node - sinks shunt current to maintain 3.000V reference. |
| 2 (–) | Anode | Reference ground return path; must be connected to system ground - completes shunt current loop. |
| 3 (N.C.) | No Connection | Internally unconnected; electrically isolated - must remain floating or tied to pin 2 to avoid parasitic leakage paths. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 footprint | 1.8mm × 1.8mm area - reduces PCB real estate by 50% vs. SOT23, ideal for wearable and compact automotive ECUs. |
| 0.1% initial accuracy | ±3.0mV at +25°C - eliminates need for post-assembly calibration in factory-set instrumentation and sensor modules. |
| No output capacitor required | Stable with any capacitive load - simplifies layout, removes BOM cost, and avoids ESR-related instability in noisy environments. |
| AEC-Q100 qualified (/V variant) | Validated for automotive Grade 1 - supports deployment in infotainment, body control, and ADAS without additional qualification effort. |
| Low 45µVRMS noise | 10Hz–10kHz bandwidth - improves effective resolution of 16-bit+ ADCs in precision data acquisition systems. |
Applications
| Automotive Engine Control Unit (ECU) | Portable Medical Glucometer |
|---|---|
Use Scenario: Provides stable 3.000V reference for oxygen sensor signal conditioning and fuel injector driver feedback loops. IC Role / Device Role / Timing Role: Two-terminal shunt reference regulating bias voltage for analog front-end op-amps and ADC inputs. Use Value: Maintains ±30mV accuracy over –40°C to +125°C ambient, ensuring consistent sensor linearity despite under-hood thermal cycling. |
Use Scenario: Supplies precision reference for electrochemical test strip ADC conversion in handheld glucose meters. IC Role / Device Role / Timing Role: Low-noise shunt reference enabling accurate 14-bit resolution from single-cell lithium battery supply. Use Value: 45µVRMS noise and 60μA minimum operating current extend battery life beyond 1,000 tests per charge. |
| Industrial Process Transmitter | Smartphone Battery Fuel Gauge |
Use Scenario: Sets reference voltage for 4–20mA loop transmitter DACs in hazardous-area pressure and flow sensors. IC Role / Device Role / Timing Role: Shunt reference providing stable 3.000V rail for current-source DAC output stage and HART modem biasing. Use Value: 100ppm/°C tempco and 15mA shunt capability ensure <0.1% full-scale error across –40°C to +85°C industrial operating range. |
Use Scenario: Delivers calibrated reference for coulomb counter ICs monitoring Li-ion battery state-of-charge during charging cycles. IC Role / Device Role / Timing Role: Precision shunt reference sourcing stable voltage to fuel gauge IC's internal ADC reference input. Use Value: 0.1% initial accuracy and long-term stability (<120ppm/1000h) reduce SoC estimation drift to <1% over 2-year device lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431AIDBVR | Adjustable 1.24V–18V shunt reference; 0.5% initial accuracy; 100ppm/°C tempco; SOT23-3 package. | Requires external resistors to set 3.0V; higher minimum cathode current (80μA); not AEC-Q100 qualified. | Select when adjustable output or higher voltage capability is needed; verify layout compatibility due to larger SOT23 footprint. |
| MAX6003EUR+T | Fixed 3.0V shunt reference; 0.2% initial accuracy; 75ppm/°C tempco; SC70-3 package; AEC-Q100 qualified. | Slightly lower accuracy but better tempco; same package size and pinout; optimized for automotive use. | Choose for tighter thermal drift budgets where 0.2% initial tolerance is acceptable; identical mounting and thermal profile. |
Compared with LM4040AEX3-3.0/V+T, TLVH431AIDBVR offers flexibility at the cost of accuracy and qualification, while MAX6003EUR+T trades 0.1% tolerance for improved temperature stability and equal automotive compliance - both require revalidation of quiescent current and noise performance in final design.
Availability
LM4040AEX3-3.0/V+T is available at Aetrix Electronics and suitable for automotive engine control units, portable medical diagnostics, industrial process transmitters, and smartphone battery management systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM4040AEX3-3.0/V+T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Maxim Integrated designs high-performance analog and mixed-signal semiconductor solutions for automotive, industrial, and communications markets, emphasizing precision, power efficiency, and reliability.
The LM4040 product line delivers micropower shunt voltage references optimized for space-constrained, high-accuracy applications where stability over temperature and time is critical - especially in automotive and portable instrumentation.
FAQ
What is the guaranteed operating temperature range for LM4040AEX3-3.0/V+T?
The LM4040AEX3-3.0/V+T is guaranteed over –40°C to +125°C ambient temperature. This extended range is confirmed by the "E" grade designation and /V suffix, which denotes AEC-Q100 qualification for automotive Grade 1 applications. The device maintains its 0.1% initial accuracy and ±100ppm/°C tempco across this full range.
Does LM4040AEX3-3.0/V+T require an external output capacitor for stability?
No, LM4040AEX3-3.0/V+T does not require an external output capacitor. Its internal design ensures stability with any capacitive load, including direct connection to ADC reference inputs or op-amp bias nodes. This eliminates capacitor-related failures and simplifies layout - a key advantage over many competing shunt references.
How does the /V suffix in LM4040AEX3-3.0/V+T affect qualification and use cases?
The /V suffix in LM4040AEX3-3.0/V+T explicitly indicates AEC-Q100 qualification for automotive applications. It confirms completion of stress tests including HTOL, TC, and ESD per Grade 1 requirements (–40°C to +125°C). This allows direct use in engine control, body electronics, and ADAS without additional component-level qualification.
What is the minimum shunt current required for LM4040AEX3-3.0/V+T to regulate properly?
The LM4040AEX3-3.0/V+T requires a minimum shunt current of 67μA (typical) to maintain regulation, with 60μA specified as the absolute minimum across temperature. Below this threshold, the 3.000V output may deviate beyond specification. Designers must ensure source resistor selection maintains ≥60μA even at lowest supply voltage and highest load current.
Can LM4040AEX3-3.0/V+T replace LM4040AIM3-3.0+T in existing SOT23-based designs?
No - LM4040AEX3-3.0/V+T uses SC70-3 packaging (1.8mm × 1.8mm), while LM4040AIM3-3.0+T uses SOT23-3 (2.9mm × 1.6mm). Though both deliver 3.000V with 0.1% accuracy, the footprint and thermal characteristics differ significantly. Direct replacement requires PCB redesign; however, LM4040AEM3-3.0/V+T (SOT23-3, /V qualified) is a pin-compatible alternative.
LM4040AEX3-3.0/V+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- SC-70, SOT-323
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 3V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±0.1%
- Temperature Coefficient:
- 100ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 45µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 67 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
LM4040AEX3-3.0/V+T FAQ
1.How can I place an order for LM4040AEX3-3.0/V+T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040AEX3-3.0/V+T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LM4040AEX3-3.0/V+T reliable?
The price and inventory of LM4040AEX3-3.0/V+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040AEX3-3.0/V+T is usually 5 days.
3.What payment methods are accepted for LM4040AEX3-3.0/V+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040AEX3-3.0/V+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040AEX3-3.0/V+T?
LM4040AEX3-3.0/V+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040AEX3-3.0/V+T order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LM4040AEX3-3.0/V+T?
For technical support, including LM4040AEX3-3.0/V+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040AEX3-3.0/V+T requirements.
6.How does Aetrix verify that LM4040AEX3-3.0/V+T is sourced from the original manufacturer or authorized distributors?
All LM4040AEX3-3.0/V+T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM4040AEX3-3.0/V+T meets industry standards.
7.What is the process for return or replacement of LM4040AEX3-3.0/V+T?
All LM4040AEX3-3.0/V+T units undergo pre-shipment inspection (PSI). If there is an issue with LM4040AEX3-3.0/V+T, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LM4040AEX3-3.0/V+T part is unused and in its original packaging.
Return procedure for LM4040AEX3-3.0/V+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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